Electro-magnetic device



(No Model.)

H. A. CHASE.

ELEOTRO MAGNETIC DEVICE.

Patented Sept. 11, 1888,

III/72671167:

Nv PETERS. Pholo-h'hvgnphor. Wnshmgwn, n. c.

Unrran STAT S PATENT OFFICE.

ll ENRY A. CHASE, OF STONlilHAll'l, MA SS A OH USETTS.

ELECTRO-MAGNETiC DEVICE.

SPECIFICATION forming part of Letters Patent No. 389,196, datedSeptember 11, 1888.

Application filed April 3, 1898.

To all whom it may concern.-

Be it known that I, HENRY A. CHASE. of Stoneham, county of Middlesex,State of Massachusetts, have invented an Improvement in ElectroMagneticDevices, of which the following description, in connection with theaccompanying drawings, is a specification, like letters on the drawingsrepresenting like parts.

This invention has for its object to construct an eleetro-magneticdevice or solenoid the movable core or armature of which moves in sostrong a magnetic field that great movement may be obtained.

In accordance with this invention, the sac cessive coils of wire arewound upon a spool, the shank and one end or flange of which arepreferably made of brass and the other end made of soft iron. The shankportion is made tubular to receive within it the movable hollowsoft-iron core or armature. The movable core or armature is suspended byits retractile spring upon an adjustable rod. Suitable contact-pointsare herein shown as attached to or connected with but insulated from thesoft iron end or head of the spool and with the movable core, and whenthe current passes through the coils of wire wound upon the spool themagnetic force accumulated in the softiron end piece is exerted upon themovable core to thereby lift it, separating the contacts. Adjustment ofthe rod upon which the movable core is mounted regulates the extent ofmovement of said core.

Figure 1 shows in vertical section an elec tro-magnetic device embodyingthis invention, the relative parts of the apparatus being shown in theposition they will occupy whenthe current is passing through the wire;and Fig. 2, a similar view with the parts in the position they willoccupy when the current ceases or is cut off.

The spool upon which the wire a is wound consists of a tubular shankportion, a, and the end piece (4, made preferably of brass, and the endpiece a made of soft iron, said end piece (6 having a shank, a", also ofsoft iron, extending inwardly toward the center of the spool for a shortdistance and recessed to embrace a portion of the tube a, to therebyform of magnetic material a portion of the tubular shank and a solidbody which closes the open Serial No. 269,504. (No m del.)

end of said shank. The shank a is preterm bly tapering.

The nppercnd of the tubular shank portion a, or that end whichterminates contiguous to the soft-iron piece or body a", is preferablyclosed by a cap of brass, with the exception of a small orifice at thecenter, through which passes the rod b, and the lower end of the saidshank is open, communicating with the interior of the hollow cap, or itmay be a bracket, d, secured to the lower end of the spool. A soft-ironcore, 0, made hollow or tubular for the greater portion of its length,is placed within the tubular shank a, extending upward into the recessformed in the shank a of the cap a, and preferably extending downwardsome distance into the hollow cap (I. The hollow core receives within ita spring, 0, one end of which is connected with the core and the otherend with the rod 0', passing vertically upward through the cap d andinto the core, so that the core will be mounted loosely upon the rod cby the spring, which spring serves as a retractile spring for the core.

The rod 0" is screw-threaded for a portion of its length, that it may beadjusted by turning the nut c, fixed to the lower end of the rod. Thecontact-points are herein shownas four in n umber, 2 3 4 5, two of whichare attached to but insulated from the soft-iron end piece a, and theremaining two are attached to but insulated from the rod b, which passesup through the soft-iron end piece a" and is connected with the core,such contact-points bcing herein shown as made of bent springs, tothereby effectuate a rubbing contact.

As the current passes over the wire a, the magnetic force accumulated inthe soft-iron end piece a a by induction is exerted upon the softironcore or armature, lifting it against the tension of the retractilespring. The tubular shank a, being made of brass, prevents the soft-ironcore from sticking. A very strong magnetic field is produced by thisconstruction or form of device, which enables the core or armature to bemoved a considerable dis tance; but if it is desired to attach a weightof some kind to the core or armature a considerable weight may belifted.

As herein shown, I have greatly increased the strength of the device byemploying alarge quantity of material for the shank a, and also a largequantity of material for the solid end of the core a, said end alwayslying in the magnetic field of the magnetic material, and by making thecore a hollow all the lines of force are centered in the solid end,sothat the action upon the coil other than that upon its end is veryslight, even should any at all exist.

I have herein shown a disk, f, of oblong shape attached to the upper endof the rod 7), which disk is normally concealed within the box orinclosing-case f, said case being provided with an opening,f,with whichthe disk fregisters when lifted, thereby displaying a visual signal.

Two wires, 7 8, are connected, one with the contact-pieces 2 3 and theother with the contact-pieces 4 5, said wires forming a part of acircuit which contains any suitable instrument or instruments desired,the device in this instance serving as a circuit-controlling device.

Instead of employing soft iron for the core and end piece a any othermagnetic material may be employed.

1 claim 1. An electromagnetic device comprisinga spool having a tubularshank and a soft-iron end piece substantially closing the open end ofthe shank, and successive coils of wire wound thereon, a hollow core orarmature having a closed end located within the said spool, a retractilespring for the core and contained within it, and a rod for supportingthesaid spring, substantially as described.

2. An electromagnetic device comprising a spool having a soft-iron endpiece and succes sive coils of wire wound thereon, a hollow core orarmature located within the spool and mounted upon a rod by a retractilespring for the core, anda visual signal connected with and operated bythe movable core, substantially as described.

3. An electromagnetic device comprising a spool having a tubular shankand an end piece, a, of brass, and an end piece, a, of soft iron,

successive coils of wire wound upon the spool, a movable core orarmature contained within the tubular shank, and a retractile spring,substantially as described.

4. An electromagnetic device comprising a spool having av tubular shank,a, an end piece, a, an end, a, having a shank portion, a, a hollow cap,d, and acore or armature, 0, contained within the tubular shank andmounted adjustably upon a rod by a retractile spring, substantially asdescribed.

5. An electro-magnetic device comprising a spool having a tubular shankaround which successive coils of wire are wound, a portion only of saidshank being of magnetic material, combined with an armature placedwithin the tubular shank, one end of which lies in the field of force ofthe magnetic material.

6. An electromagnetic device comprising a spool having a tubular shankaround which several coils of wire are wound, a portion only of saidshank being of magnetic 1n aterial,combined with the hollowarmaturehaving the end portion placed within the tubular shank, said endportion lying in the field of force of the. magnetic material,substantially as described.

7. An electromagnetic device comprising a spool having a tubular shank,an end piece of magnetic material having the flange, and the taperingshank a", recessed for a short distance, as described, combined with thearmature movable within the field of force of the magnetic material,substantially as described.

, 8. An electro magnetic device comprising a spool having a tubularshank around which several coils of wire are wound, aportion only ofsaid shank being of magnetic material,combined with the movable hollowarmature having the closed end, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HENRY A. CHASE.

Witnesses:

BERNICE J N OYES, J. O. SEARS.

